Hinge



July 27 9 19%.

- G. a. HARRISON.

HINGE Filed. August 1, 1924 Patented duly 2?, res.

Midis E. e1-

1503?, OF NEW YORK, N. Y.

Application filed August 1, 192a. Serial filo. teases.

This invention relates to hinges, particu" larly to miniature hinges,such as are used in spectacle frame construction and the like.

One of. the most troublesome parts of spectacles is the hinge whichconnects the temple of the lens frame or front. This is due to the factthat after the spectacles have been in use for a time, the screw or pinused to hold the parts of the hinge together becomes loosened and fallsout, thus necessitating repairs. l'he loosening of the screw isfrequently a. result of the stripping or partial stripping of thethreads as may be caused, for example, by a too severe tightening of thescrew at the time of its insertion or, by

4 the back and forth motion of the screw brought about by the openingand closing of screw or pin of the hinge in position. so as sairangement of the hinge.

"appears fproceeds. I

' Referring now tothe drawing which il- W lustrates a I frames;

rerent positively any loosening of the screw or pin and the consequentde- Vanous other ob'ects and .advahtages will as the description of theinvention preied embodiment of the invention, Figure l is a perspectiveview showing a hinge in position on a pair of spectacle Figure 2 is anenlarg plan view of the bin e shown in Fire 1; I

igure 3 is a sectional view on the line 3-3 of Figure 2 looking in thedirection of I the arrows;

Figure 4 is an elevation ofa five barrel hinge with a hinge member and alocking screw for same;

. ldi 5 is an elevation oi a three barrel hinge with a hinge member anda locking screw for same;

Figured is a plan view of s split joint spectacle frame showing amodification of my invention applied thereto;

tilt

Figure 7 is a sectional view on the line 9-9 of Figure 6, loo in thedirection of the arrows.

' The lockin Similar characters of reference designate similar parts ineach of the several views.

A hinge l isshown in its position on a pair of spectacle frames 1nFigure 1. One

side of the hinge is fastened to a spectacle frame front 10 and theother to a temple piece 11.

The construction of the hinge may be seen from Figures 2 and 3, in whicha three barrel hinge is shown. An upper barrel 6 and a lower barrel 5are inte ral with one side of the hin e, this being the side which isusually attac ed to the temple. A. middle barrel 7 is into ral with theother side of the hinge, WlllCl side is ordinarily aed to the front. Thelower barrel is provided with a threaded portion 8, to cooperate with anon-loosening hinge member 2 which holds the sides of the hingetogether. Said nonloosening hinge member comprises a hollow shank 3 anda locking screw i. The hollow shank has a smooth exterior surface exceptfor its lower portion 8 which is threaded. screw 4 is screwed intothreads fro lib

it'll When thehollow shank and the locking screw are tightened up andsecured in their proper positlons, it is impossible for the bin e tocome a art. In the operation of the 1nge,one si e rotates back and forthas the spectacle frames are opened and closed,

about the hinge member as an axis. As the exterior surface of the shankor hinge memher is smooth, it is practically frictionless so that thereis no tendency to unscrew the shank. It, by any chance, binding shouldoccur between the rotating barrel and the shank-tending to unscrew thelatter, the look ing screw is raised and prevents further loosening ofthe shank. This action is accomplished by the head of the locking screwlooking or binding against the face of the lower barrel, therebypreventing any fur ther rotation of the shank.

Alive barrel hinge is shown in Figure 4i and a three barrel one inFigure 5. The lower barrels are threaded to receive the threaded lowerend of the shank in both of the hinges shown. Qt course, the u perbarrels could be threaded and the sham inand locking screw are a pliedto these hinges in the same manner as escribed above.

The split joint spectacle trains shown in lltlll the outside of theshank being smooth except for the thread at its lower end. As before,

the locking screw 4 engages the internal thread of the shank, so thatloosening of the hinge is impossible. It by any chance the exteriorsurface of the shank is not smooth and binding-occurs tending to unscrewthe shank, the locking screw 1s raised and locks against the face of thelower barrel, thus preventing any further loosening.

It. should be noted that in each of the different forms of constructionthe locking screw 4 provides ample thread area for permittin'g the hingemember to be securely locked in place without danger of injuring orstripping the threads. In certain instances the external threads 8 ofthe hollow shank 3 may be omitted entirely, sufiiclent thread area andholding power being provided by the locking member 4.

While I have shown and described several forms in which my invention maybe embodied, it is understoodthat they may be modified in many respectswithout departing from the spirit of the invention as defined in theclaims hereto appended.

VVhat- I claim is 1. A spectacle frame hinge, comprising,

' in combination, a plurality of relatively rotatable barrels, thebottom one of which is threaded, a smooth shank threaded at its lowerend to engage in said threaded barrel, said shank being hollow andthreaded internally, and a retaining screw engaged in said internalthread, said screw being arranged to be pressed against said threadedbarrel by unscrewing of the shank.

2. The combination with two relatively rotatable barrels of a hingemember, comprising a smooth hollow shank threaded externally at itslower end into one of said barrels and threaded internally forsubstantially its full length, and a screw to engage said internalthreads, for limiting unscrewing of the shank from the threaded barrel.

3. A spectacle frame hinge comprising a plurality of relativelyrotatable barrels and a non-loosening hinge member, said membercomprising a smooth hollow shank provided atone end with a head integraltherewith and at the other end with a screw threaded into the shank, andheld by the shank in position to engage with one of said barrels.

4. A hinge comprising at least three bar.- rels one of the outer ones ofwhich is thread.- ed, a smooth hollow shank threaded externally toengage in said threaded barrel and also threaded internally, and a screwengaging in said internal threads and held thereby in position'to engagethe threaded barrel and prevent unscrewing of the shank therefrom.

5. In a spectacle frame the combination with two relatively rotatablehinge members of a pivot shank having right and left threaded portions,said shank passing through one of the hinge members, and threaded intothe other of them by one of said threaded portions, and a retainingmember connected to said shank by the other of said threaded portions inposition to prevent unscrewing of the shank from the hinge member inwhich it is threaded.

In testimony whereof I have aflixed my signature to this s ification.

GE RGE I. HARRISON.

